Building a VPN Using IPSec

Prior to the creation of VPN technology, the only way to secure communications between two locations was to purchase a "dedicated circuit." To secure communications across an enterprise would be tremendously expensive, and securing communications with remote users was just cost prohibitive. VPN technology provides the ability to secure communications that travel across the Internet. VPN technology allows organizations to interconnect their different locations without having to purchase dedicated lines, greatly reducing the cost of the network infrastructure.

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